Open fire dryer capable of feeding air up and down

Abstract

The open fire drying machine comprises a machine shell internally provided with a combustion chamber and a drying chamber, the drying chamber is divided into an air outlet chamber and a storage chamber by a transverse partition plate end, an air outlet of the drying chamber is located in the air outlet chamber, a first air outlet is formed in the transverse partition plate, and an air inlet channel is formed in the storage chamber through an inner vertical partition plate in an isolation mode; the lower end of the air inlet channel is provided with a lower air inlet, the upper end of the inner vertical partition plate is provided with an upper air inlet, the lower end of the air outlet channel is provided with a second air outlet communicated with the drying chamber, and the upper end of the air outlet channel is communicated with the air outlet chamber through a communicating channel part air outlet. The dryer has the advantage that the flow direction of heating gas in the drying chamber can be changed, and the problem that the drying uniformity is poor due to the fact that the direction of heating gas in the drying chamber of an existing dryer is single is solved.

Description

Technical Field

[0001] The invention relates to the technical field of food drying equipment, and in particular to an open-fire drying machine capable of taking in air from top and bottom. Background Art

[0002] In the process of food processing and production, fresh food (such as bayberry, tea, etc.) sometimes needs to be dried. There are two ways to dry food: sun drying and drying with a dryer. Some dryers are heated by electricity, and some are heated by fuel combustion (i.e., open flame heating). Corresponding to the dryer used for drying bayberry in rural households, it is heated by open flame, that is, it is heated by burning firewood. The basic structure of the dryer is: including a casing, a combustion chamber and a drying chamber for storing materials to be dried for drying are provided in the casing, a combustion furnace is provided at the lower end of the combustion chamber, and a smoke exhaust pipe extending upward with a folded line structure is provided in the combustion furnace, and the smoke exhaust pipe is a heat-conducting structure, and the upper end of the combustion chamber is provided with a combustion chamber air inlet; the upper and lower ends of the drying chamber are provided with a drying chamber air inlet connected to the lower end of the combustion chamber at one end, and a drying chamber air outlet for discharging the gas in the drying chamber at the other end. The open flame dryer has the following shortcomings: the combustion furnace is directly arranged on the bottom wall of the combustion chamber, and the heated air only flows through the upper part of the combustion furnace and the smoke exhaust pipe, which leads to a lot of heat loss through the furnace. The current solution is to fill the lower side of the combustion furnace with refractory mud for insulation. This method makes it impossible for the heat in the furnace to be promptly and fully carried away by the air to the drying chamber, and there is also the disadvantage of poor energy saving effect; the flue gas and the heated exhaust gas will take away a lot of heat; when heating and drying food, the hot air can only flow in one direction, which leads to poor uniformity during heating, and the objects at the air intake end are dried quickly while the objects at the exhaust end are dried slowly. Summary of the invention

[0003] The present invention aims to provide an open flame dryer capable of changing the flow direction of heated gas in a drying chamber and capable of taking in air from top and bottom, thereby solving the problem of poor drying uniformity caused by the single direction of heated gas in the drying chamber of the existing dryer.

[0004] The following technical problems are solved by the following technical solutions: an open flame dryer capable of taking in air from top and bottom, comprising a casing, a combustion chamber and a drying chamber for storing materials to be dried for drying, a combustion furnace being arranged at the lower end of the combustion chamber, the combustion furnace being provided with a smoke exhaust pipe extending upward with a folded line structure, the smoke exhaust pipe being a heat-conducting structure, an air inlet for the combustion chamber being arranged at the upper end of the combustion chamber; the upper and lower ends of the drying chamber are provided with a drying chamber air inlet connected to the lower end of the combustion chamber at one end, and a drying chamber air outlet for discharging the gas in the drying chamber at the other end, characterized in that a transverse partition is arranged at the upper end of the drying chamber, the transverse partition separates the air outlet chamber and the storage chamber at the upper end of the drying chamber, The drying chamber outlet is located in the outlet chamber, the first outlet is provided on the transverse partition, the inner vertical partition is provided on the left side of the storage chamber, and the right vertical partition is provided on the right side, the inner vertical partition is used to separate the inlet and outlet passages in the storage chamber, the lower end of the inlet passage is provided with the drying chamber outlet connected to the combustion chamber, the lower end of the inner vertical partition is provided with the lower inlet, and the upper end is provided with the upper inlet, the right vertical partition is used to separate the outlet and outlet passages in the storage chamber, the lower end of the outlet passage is provided with the second outlet connected to the drying chamber, and the upper end is connected to the outlet chamber through the connecting channel outlet, when hot air is input to the drying chamber through the lower inlet, the air is discharged through the first outlet, and when hot air is input to the drying chamber through the upper inlet, the air is discharged through the second outlet. When drying, the airflow direction can be from small to top or from top to bottom, so as to facilitate the start of drying.

[0005] Preferably, the ash storage chamber is provided with a blower for blowing air into the ash storage chamber, and the ash storage chamber is a sealed structure. When the combustion is incomplete, the blower is used to blow air to make the combustion complete.

[0006] Preferably, the outlet section of the smoke exhaust pipe is sleeved with an air intake pipe extending into the combustion chamber, and the outlet end of the air intake pipe and the smoke exhaust pipe form the air intake of the combustion chamber. The air intake pipe is a heat-conducting structure, and the air intake pipe is sleeved with an exhaust pipe. The inlet end of the exhaust pipe is sealed and connected to the air intake pipe. The exhaust pipe is provided with an air intake branch pipe connected to the drying chamber, and the inlet end of the air intake branch pipe forms the air outlet of the drying chamber. The exhaust exhaust gas and the heated exhaust gas can be used to preheat the intake air, which has a good energy-saving effect. The exhaust gas is stable and has a higher temperature than the heated exhaust gas and does not contain water. It is arranged inside the intake pipe for heating, and the heat recovery efficiency is higher.

[0007] Preferably, the part of the smoke exhaust pipe located in the air intake pipe is inclined with the inlet end lower and the outlet end higher, and the exhaust pipe is inclined with the inlet end higher and the outlet end lower. This can make oxygen discharge unobstructed, and unobstructed discharge leads to more complete combustion. This can prevent the condensed water generated in the heated exhaust gas from flowing back (heating fresh items, such as bayberry, will produce a lot of water vapor).

[0008] Preferably, the exhaust pipe is a heat-conducting metal structure, which can better condense and heat the water vapor in the exhaust gas.

[0009] Preferably, it further comprises an ash storage chamber located below the combustion chamber, the combustion furnace is suspended in the combustion chamber, and the combustion furnace is connected to the ash storage chamber through a plurality of ash discharge pipes. The combustion furnace is suspended so that the entire dissipated heat can be absorbed by the air flowing through, thereby achieving energy saving, that is, the same fuel can be burned to transfer more heat to the dried material. The existing combustion furnace is directly connected to the casing on one side, and the heat on the side in contact with the casing is dissipated and wasted, resulting in high energy consumption during drying.

[0010] Preferably, the ash discharge pipe is a heat-insulating structure, which can reduce the heat lost from the ash discharge pipe and further improve the energy-saving effect.

[0011] Preferably, the ash discharging pipe is hinged with an ash receiving plate through a horizontal hinge shaft, and a spring is sleeved on the hinge shaft to keep the ash receiving plate in a horizontal state and interrupt the ash discharging pipe. When the height of the ash accumulated on the ash receiving plate in the ash discharging pipe reaches a set value, the spring is pressurized and deformed to open the ash receiving plate. This can not only allow the ash to be discharged, but also reduce the heat taken away by the ash, which is equivalent to temporarily storing the ash in the ash discharging pipe and allowing the heat to be carried to the drying chamber by the air flowing through. The ash is discharged to the ash storage chamber after cooling, and the ash plays a role in heat insulation.

[0012] Preferably, a fan for generating downward wind is provided at the upper end of the combustion chamber, and the fan blades of the fan are located below the air inlet of the combustion chamber, so that the air intake can circulate smoothly without generating backflow.

[0013] Preferably, the drying chamber is provided with a return air port connected to the combustion chamber, the return air port is located above the fan blades, the drying chamber outlet is provided with an outlet door panel for opening and closing the drying chamber outlet, and the outlet door panel can be opened to close the return air port. When the items are dried to a low water vapor content, the air discharged from the drying chamber can be returned to the combustion chamber, thereby achieving energy saving.

[0014] Preferably, a temperature sensor for detecting the stability of the drying chamber is further included, and a cold air inlet is provided on the top of the combustion chamber, and the cold air inlet is provided with a cold air inlet door panel for opening and closing the cold air inlet. When a stable high temperature is detected, the cold air inlet is opened, so that part of the air enters directly without preheating, thereby achieving the purpose of cooling.

[0015] Preferably, an air inlet is formed between the outlet end of the air inlet pipe and the smoke exhaust pipe, and the air inlet is provided with a dust removal net, so as to improve the cleanliness of the air and make the dried items cleaner.

[0016] Preferably, the drying chamber is provided with a plurality of supporting bar pairs distributed in the up-down direction, two supporting bars in the same supporting bar pair are connected to the left and right side walls of the drying chamber, the supporting bars extend in the front-back direction, a drying chamber door is provided at the front side of the drying chamber, and two supporting bars in the same supporting bar pair support the left and right sides of the storage tray with a breathable structure. When in use, the materials are stored on the storage tray for drying, and the breathable structure can make the drying faster.

[0017] Preferably, the lower air inlet is hinged to a lower door panel via a lower hinge shaft extending in the front-to-back direction, the lower hinge shaft is located above the lower air inlet, and the lower door panel can be opened to close the lower end of the air inlet passage to realize the opening and closing of the upper air inlet. A technical solution for realizing the switching of the air inlet is achieved through control.

[0018] Preferably, the end of the first air outlet away from the drying chamber is hinged to an upper door plate through an upper hinge shaft extending in the front-to-back direction, and the upper door plate can be opened to close the second air outlet. A technical solution for switching between the first and second air outlets is provided.

[0019] Preferably, the main switch cable, the lower fixed pulley and the upper fixed pulley are included, one end of the lower switch cable is connected to the lower hinge shaft, the other end is connected to one end of the main switch cable after passing around the lower fixed pulley, one end of the upper switch cable is connected to the upper hinge shaft, the other end is connected to one end of the main switch cable after passing around the upper fixed pulley, the other end of the main switch cable passes through the guide hole and then passes out of the housing, the distance between the connection point of the lower switch cable and the lower hinge shaft and the axis of the lower hinge shaft is equal to the distance between the connection point of the upper switch cable and the upper hinge shaft and the axis of the upper hinge shaft, the lower hinge shaft is provided with an upper spring for driving the lower door panel to close the first outlet, and the upper hinge is provided with a driving upper door panel. When in use, when the main switch cable is pulled, the lower hinge shaft is driven to rotate by the lower switch cable so that the lower door panel closes the lower end of the air inlet channel and the lower air inlet is opened, and the upper switch cable drives the upper hinge shaft to rotate so that the upper door panel closes the second air outlet, i.e., the air outlet channel, and the air is discharged through the first air outlet.

[0020] Preferably, a water receiving tray is provided below the drying chamber, a condensation net is provided above the water receiving tray, and the inlet end of the air outlet channel is located below the condensation net, so that the air discharged can be condensed and stored.

[0021] Preferably, there are two drying chambers, which are distributed on the left and right sides of the combustion chamber, so as to improve the heat utilization rate.

[0022] Preferably, a heat insulating layer is provided on the casing to reduce energy consumption.

[0023] The present invention has the following beneficial effects: good energy-saving effect; the heat in the combustion furnace can be fully and quickly transferred to the air used for heating; the heat carried away by the smoke and heating exhaust gas is small; the temperature can be quickly adjusted during open flame heating; the airflow direction in the drying chamber can be changed, so that the food in the drying chamber can be dried evenly. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] Figure 1 It is a schematic diagram of Embodiment 1 when viewed through a vertical plane extending left and right; Figure 2 for Figure 1 A local enlarged schematic diagram of point A; Figure 3 for Figure 1 A local enlarged schematic diagram of point B; Figure 4 It is a schematic diagram of Embodiment 1 when viewed through a vertical plane extending forward and backward; Figure 5 for Figure 4 A local enlarged schematic diagram of point C; Figure 6 for Figure 4 A local enlarged schematic diagram of D; Figure 7 It is a partial schematic diagram of the second embodiment.

[0025] In the figure: casing 1, combustion chamber 2, drying chamber 3, combustion furnace 4, exhaust pipe 5, tail section 6, combustion chamber air inlet 7, drying chamber air inlet 8, drying chamber air outlet 9, ash storage chamber 10, ash outlet pipe 11, blower 50, ash storage chamber door 12, air inlet pipe 13, exhaust pipe 14, air inlet branch pipe 15, fan shaft 16, fan blades 17, fan motor 18, cold air inlet 19, cold air inlet door panel 20, dust removal net 21, support bar 22, storage tray 23, partition 24, air outlet chamber 25, storage chamber 26, first outlet Air port 27, inner vertical partition 28, outer vertical partition 29, air inlet channel 30, lower air inlet 31, upper air inlet 32, air outlet channel 33, second air outlet 34, connecting channel air outlet 35, lower hinge shaft 36, lower door panel 37, upper hinge shaft 38, upper door panel 39, main switch cable 40, lower fixed pulley 41, upper fixed pulley 42, lower switch pull rope 43, upper switch pull rope 44, guide hole 45, water collecting tray 46, condensation net 47, horizontal hinge shaft 48, ash collecting plate 49, furnace bridge 51, return air port 52, air outlet door panel 53. DETAILED DESCRIPTION

[0026] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0027] Example 1, see Figures 1 to 6 , an open flame dryer capable of taking in air from top to bottom, comprises a casing 1, a combustion chamber 2 and a drying chamber 3 for storing materials to be dried for drying are arranged in the casing. There are two drying chambers, which are distributed on the left and right sides of the combustion chamber. A heat insulation layer is arranged on the casing. A combustion furnace 4 is arranged at the lower end of the combustion chamber, and a smoke exhaust pipe 5 extending upward with a folded line structure is connected to the combustion furnace, and the smoke exhaust pipe is provided with a tail section 6 of a straight line structure. The generated ash can be separated from the burning fuel in time. A furnace bridge 51 is arranged in the combustion furnace, so that the smoke exhaust pipe is a heat-conducting structure. A combustion chamber air inlet 7 is arranged at the upper end of the combustion chamber; at the upper and lower ends of the drying chamber, one end is provided with a drying chamber air inlet 8 connected to the lower end of the combustion chamber, and the other end is provided with a drying chamber air outlet 9 for discharging the gas in the drying chamber. It also includes an ash storage chamber 10 located below the combustion chamber, and the combustion furnace is suspended in the combustion chamber, and the combustion furnace is connected to the ash storage chamber through a plurality of ash discharge pipes 11. The ash storage chamber is also provided with a blower 50 for blowing air. The ash storage chamber is a sealed structure. The outlet end of the blower is connected to the door 12 of the ash storage chamber.

[0028] When in use, the fuel (wood, etc.) is placed in the combustion furnace to burn, and the materials to be dried are stored in the drying room. The air enters from the air inlet of the combustion chamber and then flows out from the air inlet of the drying chamber into the drying room, and finally flows out of the casing from the air outlet of the drying chamber. When the air flows through the combustion chamber, it is heated by the exhaust pipe and the combustion furnace to form hot air. When the hot air flows through the drying chamber, it dries the materials to be dried. The combustion furnace is suspended so that the entire dissipated heat can be absorbed by the air flowing through, thereby playing a role in energy saving, that is, the same fuel can transfer more heat to the materials to be dried. The existing combustion furnace is directly connected to the casing on one side, and the heat on the side in contact with the casing is dissipated and wasted, resulting in high energy consumption during drying.

[0029] An air intake pipe 13 extending into the combustion chamber is sleeved on the outlet section of the smoke exhaust pipe, and an air intake port 7 for the combustion chamber is formed between the outlet end of the air intake pipe and the smoke exhaust pipe, and the air intake pipe is a heat-conducting structure. The ash discharge pipe is a heat-insulating structure. An exhaust pipe 14 is sleeved on the air intake pipe, and the inlet end of the exhaust pipe is sealed and connected to the air intake pipe. The exhaust pipe is provided with an air intake branch pipe 15 connected to the drying chamber, and the inlet end of the air intake branch pipe forms an air outlet port 9 for the drying chamber. The part of the smoke exhaust pipe located in the air intake pipe, i.e., the tail section, is inclined in a state where the inlet end is low and the outlet end is high, and the exhaust pipe is inclined in a state where the inlet end is high and the outlet end is low. The exhaust pipe is a heat-conducting metal structure. A fan for generating downward wind is provided at the upper end of the combustion chamber, and the fan includes a vertical fan shaft 16, fan blades 17 connected to the fan shaft, and a fan motor 18 for driving the fan shaft to rotate. The fan blades are located below the air intake port of the combustion chamber. The combustion chamber also includes a stable temperature sensor for detecting the drying chamber. A cold air inlet 19 is provided on the top of the combustion chamber. The cold air inlet is provided with a cold air inlet door plate 20 for opening and closing the cold air inlet. An air inlet is formed between the exhaust pipe at the outlet end of the air inlet pipe, and a dust removal net 21 is provided on the air inlet.

[0030] The drying chamber is provided with a plurality of support bar pairs distributed in the up-down direction. Two support bars 22 in the same pair of support bars are connected to the left and right side walls of the drying chamber. The support bars extend in the front-back direction. A drying chamber door is provided at the front side of the drying chamber. Two support bars in the same pair of support bars support a storage tray 23 ( Figure 1Only one storage tray is drawn in the figure). A horizontal partition 24 is provided at the upper end of the drying chamber, which separates the air outlet chamber 25 and the storage chamber 26 at the upper end of the drying chamber. The air outlet of the drying chamber is located in the air outlet chamber, and a first air outlet 27 is provided in the horizontal partition. An inner vertical partition 28 is provided on the side of the storage chamber located at the combustion chamber, and an outer vertical partition 29 is provided on the side away from the combustion chamber. The inner vertical partition separates the air inlet channel 30 in the storage chamber, and the lower end of the air inlet channel is provided with the air inlet 8 of the drying chamber connected with the combustion chamber. The lower end of the inner vertical partition is provided with a lower air inlet 31, and the upper end is provided with an upper air inlet 32. The right partition separates the air outlet channel 33 in the storage chamber, and the lower end of the air outlet channel is provided with a second air outlet 34 connected to the drying chamber, and the upper end is connected with the air outlet chamber through the connecting channel air outlet 35. When hot air is input into the drying chamber through the lower air inlet, the air is discharged through the first air outlet. When hot air is input into the drying chamber through the upper air inlet, the air is discharged through the second air outlet. The lower air inlet is hinged with a lower door panel 37 through a lower hinge shaft 36 extending in the front-to-back direction. The lower hinge shaft is located above the lower air inlet. The lower door panel can be opened to close the lower end of the air inlet channel to realize the opening and closing of the upper air inlet. The end of the first air outlet away from the drying chamber is hinged with an upper door panel 39 through an upper hinge shaft 38 extending in the front-to-back direction. The upper door panel can be opened to close the air outlet of the connecting channel. It also includes a main switch cable 40, a lower fixed pulley 41 and an upper fixed pulley 42, one end of the lower switch cable 43 is connected to the lower hinge shaft, and the other end is connected to one end of the main switch cable after passing through the lower fixed pulley, one end of the upper switch cable 44 is connected to the upper hinge shaft, and the other end is connected to one end of the main switch cable after passing through the upper fixed pulley, and the other end of the main switch cable passes through the guide hole 45 and then passes out of the housing, the distance between the connection point of the lower switch cable and the lower hinge shaft and the axis of the lower hinge shaft is equal to the distance between the connection point of the upper switch cable and the upper hinge shaft and the axis of the upper hinge shaft, the lower hinge shaft is provided with an upper spring for driving the lower door panel to close the first outlet, and the upper hinge is provided with a driving upper door panel. When in use, when the main switch cable is pulled, the lower hinge shaft is driven to rotate by the lower switch cable so that the lower door panel closes the lower end of the air inlet channel and the lower air inlet is opened, and the upper switch cable drives the upper hinge shaft to rotate so that the upper door panel closes the second air outlet, i.e., the air outlet channel, and the air is discharged through the first air outlet. A water receiving tray 46 is provided below the drying chamber, a condensation net 47 is provided above the water receiving tray, and the inlet end of the air outlet channel is located below the condensation net. The drying chamber is provided with a return air port 52 connected to the combustion chamber. The return air port is provided on the exhaust branch pipe. The return air port is located above the fan blades. The drying chamber outlet is provided with an outlet door panel 53 for opening and closing the drying chamber outlet, and the outlet door panel can be opened to close the return air port.

[0031] Embodiment 2 is different from Embodiment 1 in that: See also Figure 7An ash receiving plate 49 is hinged in the ash discharge pipe through a horizontal hinge shaft 48, and a spring is sleeved on the hinge shaft to keep the ash receiving plate in a horizontal state and interrupt the ash discharge pipe. When the height of the ash accumulated on the ash receiving plate in the ash discharge pipe reaches a set value, the spring is pressurized and deformed to open the ash receiving plate.

[0032] It should be noted that, in this article, relational terms such as first and second, etc. are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Moreover, the terms "include", "comprise" or any other variants thereof are intended to cover non-exclusive inclusion, so that a process, method, article or device including a series of elements includes not only those elements, but also other elements not explicitly listed, or also includes elements inherent to such process, method, article or device. In the absence of further restrictions, the elements defined by the sentence "comprise a ..." do not exclude the existence of other identical elements in the process, method, article or device including the elements.

[0033] Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention, and that the scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. An open flame dryer capable of taking in air from top to bottom, comprising a casing, a combustion chamber and a drying chamber for storing materials to be dried for drying are arranged in the casing, a combustion furnace is arranged at the lower end of the combustion chamber, a smoke exhaust pipe extending upward with a folded line structure is arranged at the combustion furnace, the smoke exhaust pipe is a heat-conducting structure, an air inlet for the combustion chamber is arranged at the upper end of the combustion chamber; the upper and lower ends of the drying chamber are provided with a drying chamber air inlet connected to the lower end of the combustion chamber at one end, and a drying chamber air outlet for discharging gas in the drying chamber at the other end, characterized in that The drying chamber is provided with a transverse partition at the upper end of the drying chamber, and the transverse partition separates the air outlet chamber and the storage chamber at the upper end of the drying chamber, the air outlet of the drying chamber is located in the air outlet chamber, and the transverse partition is provided with a first air outlet, the storage chamber is provided with an inner vertical partition on the side facing the combustion chamber, and a right vertical partition on the side away from the combustion chamber, the inner vertical partition separates the air inlet and outlet channels in the storage chamber, and the lower end of the air inlet channel is provided with a drying chamber air inlet connected to the combustion chamber, the lower end of the inner vertical partition is provided with a lower air inlet, and the upper end is provided with an upper air inlet, the right partition separates the air outlet and outlet channels in the storage chamber, the lower end of the air outlet channel is provided with a second air outlet connected to the drying chamber, and the upper end is connected to the air outlet chamber through the connecting channel air outlet, when hot air is input into the drying chamber through the lower air inlet, air is discharged through the first air outlet, and when hot air is input into the drying chamber through the upper air inlet, air is discharged through the second air outlet.

2. The open flame dryer capable of upward and downward air intake according to claim 1, characterized in that: The lower air inlet is hinged with a lower door panel via a lower hinge shaft extending in the front-to-back direction, the lower hinge shaft is located above the lower air inlet, the lower door panel can be opened to close the lower end of the air inlet passage to achieve opening and closing of the upper air inlet, and the end of the first air outlet away from the drying chamber is hinged with an upper door panel via an upper hinge shaft extending in the front-to-back direction, the upper door panel can be opened to close the second air outlet.

3. The open flame dryer capable of upward and downward air intake according to claim 2, characterized in that: It includes a main switch cable, a lower fixed pulley and an upper fixed pulley, one end of the lower switch cable is connected to the lower hinge shaft, and the other end is connected to one end of the main switch cable after passing around the lower fixed pulley, one end of the upper switch cable is connected to the upper hinge shaft, and the other end is connected to one end of the main switch cable after passing around the upper fixed pulley, the other end of the main switch cable passes through the guide hole and then passes out of the casing, the distance between the connection point of the lower switch cable and the lower hinge shaft and the axis of the lower hinge shaft is equal to the distance between the connection point of the upper switch cable and the upper hinge shaft and the axis of the upper hinge shaft, the lower hinge shaft is provided with an upper spring for driving the lower door panel to close the first exit, and the upper hinge is provided with a driving upper door panel.

4. The open flame dryer capable of upward and downward air intake according to claim 3, characterized in that: A water receiving tray is arranged below the drying chamber, a condensation net is arranged above the water receiving tray, and the inlet end of the air outlet channel is located below the condensation net.

5. The open flame dryer capable of upward and downward air intake according to claim 1, characterized in that: It also includes an ash storage chamber located below the combustion chamber. The combustion furnace is suspended in the combustion chamber, and the combustion furnace is connected to the ash storage chamber through a plurality of ash discharge pipes.

6. The open flame dryer capable of upward and downward air intake according to claim 5, characterized in that: The ash discharge pipe is an insulated structure, and an ash receiving plate is hinged inside the ash discharge pipe through a horizontal hinge shaft. A spring is sleeved on the hinge shaft to maintain the ash receiving plate in a horizontal state and interrupt the ash discharge pipe. When the height of ash accumulated on the ash receiving plate in the ash discharge pipe reaches a set value, the spring is pressurized and deformed to open the ash receiving plate.

7. The open flame dryer capable of upward and downward air intake according to claim 1, characterized in that: A fan for generating downward wind is provided at the upper end of the combustion chamber, and the fan blades of the fan are located below the air inlet of the combustion chamber. The drying chamber is provided with a return air port connected to the combustion chamber, and the return air port is located above the fan blades. The air outlet of the drying chamber is provided with an air outlet door panel for opening and closing the air outlet of the drying chamber, and the air outlet door panel can be opened to close the return air port.

8. The open flame dryer capable of upward and downward air intake according to claim 1, characterized in that: The outlet section of the smoke exhaust pipe is sleeved with an air intake pipe extending into the combustion chamber, and an air intake port of the combustion chamber is formed between the outlet end of the air intake pipe and the smoke exhaust pipe. The air intake pipe is a heat-conducting structure, and an exhaust pipe is sleeved on the air intake pipe. The inlet end of the exhaust pipe is sealed and connected to the air intake pipe. The exhaust pipe is provided with an air intake branch pipe connected to the drying chamber, and the inlet end of the air intake branch pipe forms the air outlet of the drying chamber.

9. The open flame dryer capable of upward and downward air intake according to claim 8, characterized in that: The portion of the smoke exhaust pipe located in the air intake pipe is inclined in a state where the inlet end is low and the outlet end is high, and the exhaust pipe is inclined in a state where the inlet end is high and the outlet end is low.

10. The open flame dryer capable of upward and downward air intake according to claim 1, characterized in that: The drying chamber is provided with a plurality of support bar pairs distributed in the up-down direction, the two support bars in the same pair are connected to the left and right side walls of the drying chamber, the support bars extend in the front-to-back direction, a drying chamber door is provided on the front side of the drying chamber, and the two support bars in the same pair support the left and right sides of the storage tray with a breathable structure.

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